Hi, I will like to know

Could you talk about US infrastructure in these three points from economics points of view ,

-Why Have Governments Invested in Infrastructure? Perspectives from U.S. History

-What Determines the Optimal Level of Public Infrastructure Spending?

-Pricing, Provision, and Maintenance

And why is in fracture priced through a classic two-part tariff?

Anything is welcomed , please do good references as well, thank you!

Anything, any references are welcomed.